$($a$)$ Fig.Q$1$ is a picture showing a damsite preparation$/$ treatment of froundotinn and an$...........$ in

Fig.Q$1$: Dam site foundation preparation and treatment

$($i$)$ Explain the works and purposes of the preparation$/$treatments $(9$ marks$).$ In the context of Advanced hydraulic structures in Civil engineering,give an accurate reqiured answear to the uploaded image